/**
 * CryptoJS core components.
 */
var CryptoJS = CryptoJS || (function (Math, undefined) {
  /*
   * Local polyfil of Object.create
   */
  var create = Object.create || (function () {
      function F() {}

      return function (obj) {
          var subtype;

          F.prototype = obj;

          subtype = new F();

          F.prototype = null;

          return subtype;
      };
  }())

  /**
   * CryptoJS namespace.
   */
  var C = {};

  /**
   * Library namespace.
   */
  var C_lib = C.lib = {};

  /**
   * Base object for prototypal inheritance.
   */
  var Base = C_lib.Base = (function () {


      return {
          /**
           * Creates a new object that inherits from this object.
           *
           * @param {Object} overrides Properties to copy into the new object.
           *
           * @return {Object} The new object.
           *
           * @static
           *
           * @example
           *
           *     var MyType = CryptoJS.lib.Base.extend({
           *         field: 'value',
           *
           *         method: function () {
           *         }
           *     });
           */
          extend: function (overrides) {
              // Spawn
              var subtype = create(this);

              // Augment
              if (overrides) {
                  subtype.mixIn(overrides);
              }

              // Create default initializer
              if (!subtype.hasOwnProperty('init') || this.init === subtype.init) {
                  subtype.init = function () {
                      subtype.$super.init.apply(this, arguments);
                  };
              }

              // Initializer's prototype is the subtype object
              subtype.init.prototype = subtype;

              // Reference supertype
              subtype.$super = this;

              return subtype;
          },

          /**
           * Extends this object and runs the init method.
           * Arguments to create() will be passed to init().
           *
           * @return {Object} The new object.
           *
           * @static
           *
           * @example
           *
           *     var instance = MyType.create();
           */
          create: function () {
              var instance = this.extend();
              instance.init.apply(instance, arguments);

              return instance;
          },

          /**
           * Initializes a newly created object.
           * Override this method to add some logic when your objects are created.
           *
           * @example
           *
           *     var MyType = CryptoJS.lib.Base.extend({
           *         init: function () {
           *             // ...
           *         }
           *     });
           */
          init: function () {
          },

          /**
           * Copies properties into this object.
           *
           * @param {Object} properties The properties to mix in.
           *
           * @example
           *
           *     MyType.mixIn({
           *         field: 'value'
           *     });
           */
          mixIn: function (properties) {
              for (var propertyName in properties) {
                  if (properties.hasOwnProperty(propertyName)) {
                      this[propertyName] = properties[propertyName];
                  }
              }

              // IE won't copy toString using the loop above
              if (properties.hasOwnProperty('toString')) {
                  this.toString = properties.toString;
              }
          },

          /**
           * Creates a copy of this object.
           *
           * @return {Object} The clone.
           *
           * @example
           *
           *     var clone = instance.clone();
           */
          clone: function () {
              return this.init.prototype.extend(this);
          }
      };
  }());

  /**
   * An array of 32-bit words.
   *
   * @property {Array} words The array of 32-bit words.
   * @property {number} sigBytes The number of significant bytes in this word array.
   */
  var WordArray = C_lib.WordArray = Base.extend({
      /**
       * Initializes a newly created word array.
       *
       * @param {Array} words (Optional) An array of 32-bit words.
       * @param {number} sigBytes (Optional) The number of significant bytes in the words.
       *
       * @example
       *
       *     var wordArray = CryptoJS.lib.WordArray.create();
       *     var wordArray = CryptoJS.lib.WordArray.create([0x00010203, 0x04050607]);
       *     var wordArray = CryptoJS.lib.WordArray.create([0x00010203, 0x04050607], 6);
       */
      init: function (words, sigBytes) {
          words = this.words = words || [];

          if (sigBytes != undefined) {
              this.sigBytes = sigBytes;
          } else {
              this.sigBytes = words.length * 4;
          }
      },

      /**
       * Converts this word array to a string.
       *
       * @param {Encoder} encoder (Optional) The encoding strategy to use. Default: CryptoJS.enc.Hex
       *
       * @return {string} The stringified word array.
       *
       * @example
       *
       *     var string = wordArray + '';
       *     var string = wordArray.toString();
       *     var string = wordArray.toString(CryptoJS.enc.Utf8);
       */
      toString: function (encoder) {
          return (encoder || Hex).stringify(this);
      },

      /**
       * Concatenates a word array to this word array.
       *
       * @param {WordArray} wordArray The word array to append.
       *
       * @return {WordArray} This word array.
       *
       * @example
       *
       *     wordArray1.concat(wordArray2);
       */
      concat: function (wordArray) {
          // Shortcuts
          var thisWords = this.words;
          var thatWords = wordArray.words;
          var thisSigBytes = this.sigBytes;
          var thatSigBytes = wordArray.sigBytes;

          // Clamp excess bits
          this.clamp();

          // Concat
          if (thisSigBytes % 4) {
              // Copy one byte at a time
              for (var i = 0; i < thatSigBytes; i++) {
                  var thatByte = (thatWords[i >>> 2] >>> (24 - (i % 4) * 8)) & 0xff;
                  thisWords[(thisSigBytes + i) >>> 2] |= thatByte << (24 - ((thisSigBytes + i) % 4) * 8);
              }
          } else {
              // Copy one word at a time
              for (var i = 0; i < thatSigBytes; i += 4) {
                  thisWords[(thisSigBytes + i) >>> 2] = thatWords[i >>> 2];
              }
          }
          this.sigBytes += thatSigBytes;

          // Chainable
          return this;
      },

      /**
       * Removes insignificant bits.
       *
       * @example
       *
       *     wordArray.clamp();
       */
      clamp: function () {
          // Shortcuts
          var words = this.words;
          var sigBytes = this.sigBytes;

          // Clamp
          words[sigBytes >>> 2] &= 0xffffffff << (32 - (sigBytes % 4) * 8);
          words.length = Math.ceil(sigBytes / 4);
      },

      /**
       * Creates a copy of this word array.
       *
       * @return {WordArray} The clone.
       *
       * @example
       *
       *     var clone = wordArray.clone();
       */
      clone: function () {
          var clone = Base.clone.call(this);
          clone.words = this.words.slice(0);

          return clone;
      },

      /**
       * Creates a word array filled with random bytes.
       *
       * @param {number} nBytes The number of random bytes to generate.
       *
       * @return {WordArray} The random word array.
       *
       * @static
       *
       * @example
       *
       *     var wordArray = CryptoJS.lib.WordArray.random(16);
       */
      random: function (nBytes) {
          var words = [];

          var r = function (m_w) {
              var m_w = m_w;
              var m_z = 0x3ade68b1;
              var mask = 0xffffffff;

              return function () {
                  m_z = (0x9069 * (m_z & 0xFFFF) + (m_z >> 0x10)) & mask;
                  m_w = (0x4650 * (m_w & 0xFFFF) + (m_w >> 0x10)) & mask;
                  var result = ((m_z << 0x10) + m_w) & mask;
                  result /= 0x100000000;
                  result += 0.5;
                  return result * (Math.random() > 0.5 ? 1 : -1);
              }
          };

          for (var i = 0, rcache; i < nBytes; i += 4) {
              var _r = r((rcache || Math.random()) * 0x100000000);

              rcache = _r() * 0x3ade67b7;
              words.push((_r() * 0x100000000) | 0);
          }

          return new WordArray.init(words, nBytes);
      }
  });

  /**
   * Encoder namespace.
   */
  var C_enc = C.enc = {};

  /**
   * Hex encoding strategy.
   */
  var Hex = C_enc.Hex = {
      /**
       * Converts a word array to a hex string.
       *
       * @param {WordArray} wordArray The word array.
       *
       * @return {string} The hex string.
       *
       * @static
       *
       * @example
       *
       *     var hexString = CryptoJS.enc.Hex.stringify(wordArray);
       */
      stringify: function (wordArray) {
          // Shortcuts
          var words = wordArray.words;
          var sigBytes = wordArray.sigBytes;

          // Convert
          var hexChars = [];
          for (var i = 0; i < sigBytes; i++) {
              var bite = (words[i >>> 2] >>> (24 - (i % 4) * 8)) & 0xff;
              hexChars.push((bite >>> 4).toString(16));
              hexChars.push((bite & 0x0f).toString(16));
          }

          return hexChars.join('');
      },

      /**
       * Converts a hex string to a word array.
       *
       * @param {string} hexStr The hex string.
       *
       * @return {WordArray} The word array.
       *
       * @static
       *
       * @example
       *
       *     var wordArray = CryptoJS.enc.Hex.parse(hexString);
       */
      parse: function (hexStr) {
          // Shortcut
          var hexStrLength = hexStr.length;

          // Convert
          var words = [];
          for (var i = 0; i < hexStrLength; i += 2) {
              words[i >>> 3] |= parseInt(hexStr.substr(i, 2), 16) << (24 - (i % 8) * 4);
          }

          return new WordArray.init(words, hexStrLength / 2);
      }
  };

  /**
   * Latin1 encoding strategy.
   */
  var Latin1 = C_enc.Latin1 = {
      /**
       * Converts a word array to a Latin1 string.
       *
       * @param {WordArray} wordArray The word array.
       *
       * @return {string} The Latin1 string.
       *
       * @static
       *
       * @example
       *
       *     var latin1String = CryptoJS.enc.Latin1.stringify(wordArray);
       */
      stringify: function (wordArray) {
          // Shortcuts
          var words = wordArray.words;
          var sigBytes = wordArray.sigBytes;

          // Convert
          var latin1Chars = [];
          for (var i = 0; i < sigBytes; i++) {
              var bite = (words[i >>> 2] >>> (24 - (i % 4) * 8)) & 0xff;
              latin1Chars.push(String.fromCharCode(bite));
          }

          return latin1Chars.join('');
      },

      /**
       * Converts a Latin1 string to a word array.
       *
       * @param {string} latin1Str The Latin1 string.
       *
       * @return {WordArray} The word array.
       *
       * @static
       *
       * @example
       *
       *     var wordArray = CryptoJS.enc.Latin1.parse(latin1String);
       */
      parse: function (latin1Str) {
          // Shortcut
          var latin1StrLength = latin1Str.length;

          // Convert
          var words = [];
          for (var i = 0; i < latin1StrLength; i++) {
              words[i >>> 2] |= (latin1Str.charCodeAt(i) & 0xff) << (24 - (i % 4) * 8);
          }

          return new WordArray.init(words, latin1StrLength);
      }
  };

  /**
   * UTF-8 encoding strategy.
   */
  var Utf8 = C_enc.Utf8 = {
      /**
       * Converts a word array to a UTF-8 string.
       *
       * @param {WordArray} wordArray The word array.
       *
       * @return {string} The UTF-8 string.
       *
       * @static
       *
       * @example
       *
       *     var utf8String = CryptoJS.enc.Utf8.stringify(wordArray);
       */
      stringify: function (wordArray) {
          try {
              return decodeURIComponent(escape(Latin1.stringify(wordArray)));
          } catch (e) {
              throw new Error('Malformed UTF-8 data');
          }
      },

      /**
       * Converts a UTF-8 string to a word array.
       *
       * @param {string} utf8Str The UTF-8 string.
       *
       * @return {WordArray} The word array.
       *
       * @static
       *
       * @example
       *
       *     var wordArray = CryptoJS.enc.Utf8.parse(utf8String);
       */
      parse: function (utf8Str) {
          return Latin1.parse(unescape(encodeURIComponent(utf8Str)));
      }
  };

  /**
   * Abstract buffered block algorithm template.
   *
   * The property blockSize must be implemented in a concrete subtype.
   *
   * @property {number} _minBufferSize The number of blocks that should be kept unprocessed in the buffer. Default: 0
   */
  var BufferedBlockAlgorithm = C_lib.BufferedBlockAlgorithm = Base.extend({
      /**
       * Resets this block algorithm's data buffer to its initial state.
       *
       * @example
       *
       *     bufferedBlockAlgorithm.reset();
       */
      reset: function () {
          // Initial values
          this._data = new WordArray.init();
          this._nDataBytes = 0;
      },

      /**
       * Adds new data to this block algorithm's buffer.
       *
       * @param {WordArray|string} data The data to append. Strings are converted to a WordArray using UTF-8.
       *
       * @example
       *
       *     bufferedBlockAlgorithm._append('data');
       *     bufferedBlockAlgorithm._append(wordArray);
       */
      _append: function (data) {
          // Convert string to WordArray, else assume WordArray already
          if (typeof data == 'string') {
              data = Utf8.parse(data);
          }

          // Append
          this._data.concat(data);
          this._nDataBytes += data.sigBytes;
      },

      /**
       * Processes available data blocks.
       *
       * This method invokes _doProcessBlock(offset), which must be implemented by a concrete subtype.
       *
       * @param {boolean} doFlush Whether all blocks and partial blocks should be processed.
       *
       * @return {WordArray} The processed data.
       *
       * @example
       *
       *     var processedData = bufferedBlockAlgorithm._process();
       *     var processedData = bufferedBlockAlgorithm._process(!!'flush');
       */
      _process: function (doFlush) {
          var processedWords;
          
          // Shortcuts
          var data = this._data;
          var dataWords = data.words;
          var dataSigBytes = data.sigBytes;
          var blockSize = this.blockSize;
          var blockSizeBytes = blockSize * 4;

          // Count blocks ready
          var nBlocksReady = dataSigBytes / blockSizeBytes;
          if (doFlush) {
              // Round up to include partial blocks
              nBlocksReady = Math.ceil(nBlocksReady);
          } else {
              // Round down to include only full blocks,
              // less the number of blocks that must remain in the buffer
              nBlocksReady = Math.max((nBlocksReady | 0) - this._minBufferSize, 0);
          }

          // Count words ready
          var nWordsReady = nBlocksReady * blockSize;

          // Count bytes ready
          var nBytesReady = Math.min(nWordsReady * 4, dataSigBytes);

          // Process blocks
          if (nWordsReady) {
              for (var offset = 0; offset < nWordsReady; offset += blockSize) {
                  // Perform concrete-algorithm logic
                  this._doProcessBlock(dataWords, offset);
              }

              // Remove processed words
              processedWords = dataWords.splice(0, nWordsReady);
              data.sigBytes -= nBytesReady;
          }

          // Return processed words
          return new WordArray.init(processedWords, nBytesReady);
      },

      /**
       * Creates a copy of this object.
       *
       * @return {Object} The clone.
       *
       * @example
       *
       *     var clone = bufferedBlockAlgorithm.clone();
       */
      clone: function () {
          var clone = Base.clone.call(this);
          clone._data = this._data.clone();

          return clone;
      },

      _minBufferSize: 0
  });

  /**
   * Abstract hasher template.
   *
   * @property {number} blockSize The number of 32-bit words this hasher operates on. Default: 16 (512 bits)
   */
  var Hasher = C_lib.Hasher = BufferedBlockAlgorithm.extend({
      /**
       * Configuration options.
       */
      cfg: Base.extend(),

      /**
       * Initializes a newly created hasher.
       *
       * @param {Object} cfg (Optional) The configuration options to use for this hash computation.
       *
       * @example
       *
       *     var hasher = CryptoJS.algo.SHA256.create();
       */
      init: function (cfg) {
          // Apply config defaults
          this.cfg = this.cfg.extend(cfg);

          // Set initial values
          this.reset();
      },

      /**
       * Resets this hasher to its initial state.
       *
       * @example
       *
       *     hasher.reset();
       */
      reset: function () {
          // Reset data buffer
          BufferedBlockAlgorithm.reset.call(this);

          // Perform concrete-hasher logic
          this._doReset();
      },

      /**
       * Updates this hasher with a message.
       *
       * @param {WordArray|string} messageUpdate The message to append.
       *
       * @return {Hasher} This hasher.
       *
       * @example
       *
       *     hasher.update('message');
       *     hasher.update(wordArray);
       */
      update: function (messageUpdate) {
          // Append
          this._append(messageUpdate);

          // Update the hash
          this._process();

          // Chainable
          return this;
      },

      /**
       * Finalizes the hash computation.
       * Note that the finalize operation is effectively a destructive, read-once operation.
       *
       * @param {WordArray|string} messageUpdate (Optional) A final message update.
       *
       * @return {WordArray} The hash.
       *
       * @example
       *
       *     var hash = hasher.finalize();
       *     var hash = hasher.finalize('message');
       *     var hash = hasher.finalize(wordArray);
       */
      finalize: function (messageUpdate) {
          // Final message update
          if (messageUpdate) {
              this._append(messageUpdate);
          }

          // Perform concrete-hasher logic
          var hash = this._doFinalize();

          return hash;
      },

      blockSize: 512/32,

      /**
       * Creates a shortcut function to a hasher's object interface.
       *
       * @param {Hasher} hasher The hasher to create a helper for.
       *
       * @return {Function} The shortcut function.
       *
       * @static
       *
       * @example
       *
       *     var SHA256 = CryptoJS.lib.Hasher._createHelper(CryptoJS.algo.SHA256);
       */
      _createHelper: function (hasher) {
          return function (message, cfg) {
              return new hasher.init(cfg).finalize(message);
          };
      },

      /**
       * Creates a shortcut function to the HMAC's object interface.
       *
       * @param {Hasher} hasher The hasher to use in this HMAC helper.
       *
       * @return {Function} The shortcut function.
       *
       * @static
       *
       * @example
       *
       *     var HmacSHA256 = CryptoJS.lib.Hasher._createHmacHelper(CryptoJS.algo.SHA256);
       */
      _createHmacHelper: function (hasher) {
          return function (message, key) {
              return new C_algo.HMAC.init(hasher, key).finalize(message);
          };
      }
  });

  /**
   * Algorithm namespace.
   */
  var C_algo = C.algo = {};

  return C;
}(Math));
